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I have a fascination with VFDs/VVVFs/frequency inverters. They are the controllers that gives of a specific hum/whine from electric trains/cars and from other 3 phase electric motors.
I'm making my own sudo-vvvf at home. I just think they sound awesome and are Hella cool
https://youtu.be/-SDYdHzT7Qw (sound starts at 0:13)
That's really dope!! I've heard about this a few times. So you have a good video or site you could recommend that explains for layman why they do that?
I can suggest simply looking around YouTube. That way you can get a sense of how they work and what kind you'd like to know more about. I happen to have practical experience with the, because I used to work on trains that had some giant versions